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A260055 Composites whose prime factorization in base 12 is an anagram of the number in base 12. 11

%I #17 Jul 24 2015 03:55:03

%S 169,185,219,2165,2402,3981,4205,10031,21349,21907,22049,24199,26919,

%T 27746,28802,29767,29919,31107,46749,71375,251521,252257,252361,

%U 259565,275237,280587,292159,293011,301163,303161,305765

%N Composites whose prime factorization in base 12 is an anagram of the number in base 12.

%H Giovanni Resta, <a href="/A260055/b260055.txt">Table of n, a(n) for n = 1..10000</a>

%e 169 = 13^2. In base 12, 121 = 11^2.

%o (PARI) isok(n, b) = {f = factor(n); v = []; for (i=1, #f~, v = concat(v, digits(f[i,1], b)); if (f[i,2]!= 1, v = concat(v, digits(f[i,2], b)));); vecsort(v) == vecsort(digits(n, b));}

%o lista(nn, b=12) = forcomposite(n=1, nn, if (isok(n,b), print1(n, ", "))); \\ _Michel Marcus_, Jul 14 2015

%Y Cf. A260046, A260047, A260048, A260049, A260050, A260051, A260052, A260053, A025283, A260054.

%K base,easy,nonn

%O 1,1

%A _Stephen Tucker_, Jul 14 2015

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Last modified April 24 05:26 EDT 2024. Contains 371918 sequences. (Running on oeis4.)